Ultra-low-current LDO targets low-power handheld and wearable device applications

Available from Diodes Incorporated, with output voltages from 1.2V to 3.3V and supporting load currents up to 150mA, the AP7350 low dropout voltage regulator (LDO) targets low-power handheld and wearable device applications. Its ultra-low quiescent current of just 0.25µA and 1% accuracy enable designs to achieve extended battery life while a chip-scale package just 0.64mm square occupies the smallest possible board space. The design of the LDO recognizes two of the key requirements inherent in the multitude of new sensing applications that are contributing to growth of the IoT. These are the need for low power consumption, since many devices will be battery-powered, and small size, to fit the often-constrained form factor designs typified by wearable devices. With a quiescent current of 0.25µA and a typical standby current of 20nA the LDO enables low sampling rate system designs that can operate for years on a single coin cell battery. The miniature chip-scale package is between a quarter and half the size of competitive solutions, and has a low profile of just 0.34mm. The device is offered with seven output voltages: 1.2V, 1.5V, 1.8V 2.5V, 2.8V, 3V, and 3.3V. These address the voltage rail requirements of microcontroller, FPGA, other digital and analog ICs, and sensor circuits commonly found in low-power IoT applications. Output accuracy is 1% at room temperature and 1.5% over the full -40C to +85C operating temperature range.